[PATCH v3 03/21] clk: bind clk to new parent device

[Claudiu Beznea]

Clock re-parenting is not binding the clock's device to its new
parent device, it only calls the clock's ops->set_parent() API. The
changes in this commit re-parent the clock device to its new parent
so that subsequent operations like clk_get_parent() to point to the
proper parent.

Signed-off-by: Claudiu Beznea <claudiu.beznea at microchip.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
 drivers/clk/clk-uclass.c | 11 ++++++++++-
 test/dm/clk_ccf.c        | 27 +++++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c
index 934cd5787a5c..5e0c8419d65b 100644
--- a/drivers/clk/clk-uclass.c
+++ b/drivers/clk/clk-uclass.c
@@ -14,6 +14,7 @@
 #include <errno.h>
 #include <log.h>
 #include <malloc.h>
+#include <dm/device-internal.h>
 #include <dm/devres.h>
 #include <dm/read.h>
 #include <linux/bug.h>
@@ -512,6 +513,7 @@ ulong clk_set_rate(struct clk *clk, ulong rate)
 int clk_set_parent(struct clk *clk, struct clk *parent)
 {
 	const struct clk_ops *ops;
+	int ret;
 
 	debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
 	if (!clk_valid(clk))
@@ -521,7 +523,14 @@ int clk_set_parent(struct clk *clk, struct clk *parent)
 	if (!ops->set_parent)
 		return -ENOSYS;
 
-	return ops->set_parent(clk, parent);
+	ret = ops->set_parent(clk, parent);
+	if (ret)
+		return ret;
+
+	if (CONFIG_IS_ENABLED(CLK_CCF))
+		ret = device_reparent(clk->dev, parent->dev);
+
+	return ret;
 }
 
 int clk_enable(struct clk *clk)
diff --git a/test/dm/clk_ccf.c b/test/dm/clk_ccf.c
index 32bc4d2b8a0c..1ce28d747dbe 100644
--- a/test/dm/clk_ccf.c
+++ b/test/dm/clk_ccf.c
@@ -22,6 +22,10 @@ static int dm_test_clk_ccf(struct unit_test_state *uts)
 	struct udevice *dev;
 	long long rate;
 	int ret;
+#if CONFIG_IS_ENABLED(CLK_CCF)
+	const char *clkname;
+	int clkid;
+#endif
 
 	/* Get the device using the clk device */
 	ut_assertok(uclass_get_device_by_name(UCLASS_CLK, "clk-ccf", &dev));
@@ -130,6 +134,29 @@ static int dm_test_clk_ccf(struct unit_test_state *uts)
 
 	ret = sandbox_clk_enable_count(pclk);
 	ut_asserteq(ret, 0);
+
+	/* Test clock re-parenting. */
+	ret = clk_get_by_id(SANDBOX_CLK_USDHC1_SEL, &clk);
+	ut_assertok(ret);
+	ut_asserteq_str("usdhc1_sel", clk->dev->name);
+
+	pclk = clk_get_parent(clk);
+	ut_assertok_ptr(pclk);
+	if (!strcmp(pclk->dev->name, "pll3_60m")) {
+		clkname = "pll3_80m";
+		clkid = SANDBOX_CLK_PLL3_80M;
+	} else {
+		clkname = "pll3_60m";
+		clkid = SANDBOX_CLK_PLL3_60M;
+	}
+
+	ret = clk_get_by_id(clkid, &pclk);
+	ut_assertok(ret);
+	ret = clk_set_parent(clk, pclk);
+	ut_assertok(ret);
+	pclk = clk_get_parent(clk);
+	ut_assertok_ptr(pclk);
+	ut_asserteq_str(clkname, pclk->dev->name);
 #endif
 
 	return 1;
-- 
2.7.4